<template>
  <div>
    <div class="search">
      <input type="text" v-model="keyword" placeholder="输入城市名或拼音" class="search-input"/>
    </div>
    <div class="search-content" v-show="keyword" ref="searchContent">
      <ul>
        <li class="search-item border-bottom"
            v-for="item in list"
            :key="item.id"
            @click="handleCityClick(item.name)"
        >{{item.name}}
        </li>
        <li class="search-item border-bottom" v-if="hasNoData">没有找到匹配的数据</li>

      </ul>
    </div>
  </div>
</template>

<script>
  import BScroll from 'better-scroll'
  import {mapState, mapMutations} from 'vuex'
  export default {
    name: 'CitySearch',
    props: {
      cities: Object
    },
    methods:{
      handleCityClick(city) {
        // 点击热门城市，要在$store里面dispatch一个事件，同时将城市数据传过去
        // this.$store.dispatch('changeCity', city);
        this.changeCity(city);
        this.$router.push('/');
      },
      ...mapMutations(['changeCity'])
    },
    data() {
      return {
        keyword: '',
        list: [],
        timer: null
      }
    },
    computed: {
      hasNoData() {
        return !this.list.length
      }
    },
    // 侦听器 监听keyword的变化
    watch: {
      keyword() {
        if (!this.keyword) {
          this.list = []
          return
        }
        if (this.timer) {
          clearTimeout(this.timer)
        }
        this.timer = setTimeout(() => {
          const result = [];
          //遍历城市对象cities[i]是一个数组
          for (let i in this.cities) {
            this.cities[i].forEach((value) => {
              if (value.spell.indexOf(this.keyword) > -1 ||
                value.name.indexOf(this.keyword) > -1) {
                result.push(value);
              }
            })
          }
          this.list = result;
        }, 1000)
      }
    },
    mounted() {
      this.scroll = new BScroll(this.$refs.searchContent)
    },

  }
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .search
    height: .72rem
    padding: 0 .1rem
    background: $bgColor
    .search-input
      box-sizing: border-box
      width: 100%
      height: .62rem
      padding: 0 .1rem
      line-height: .62rem
      text-align: center
      border-radius: .06rem
      color: #666

  .search-content
    z-index: 1
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    background: #eee
    .search-item
      text-align: left
      line-height: .62rem
      padding-left: .2rem
      background: #fff
      color: #666
</style>
